In practical applications, Internet information provider can provide value-added services such as Online Live, IPTV, Distance Education, Telemedicine, Internet Radio and Real-time Video Conferences more conveniently using multicast. In a point-to-multipoint network, multicast technology not only transmits data with high efficiency, but also saves a large bandwidth and reduces network load. With multicast, the source only need to send one piece of information, and all and only the users who need the information will receive copies of the information. Multicast, however, solves all the problems caused by unicast and broadcast. With broadcast, information will be sent to all users in the network no matter they need it or not, wasting network resources and impacting information security. With unicast, many copies of the same information will be sent to all the receivers, occupying a large bandwidth. In a point-to-multipoint network, packets can be sent in three ways: unicast, broadcast and multicast.
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